Light bulb



FIG. 1 is a front elevational view of a light bulb showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a top perspective view thereof; and,

FIG. 7 is a bottom perspective view thereof.

The broken lines illustrate portions of the light bulb which form no part of the claimed design.

The views of the light bulb that are not shown form no part of the claimed design. 

CLAIM The ornamental design for a light bulb, as shown and described. 